libubox: update to latest version, adds libjson-script

git-svn-id: svn://svn.openwrt.org/openwrt@35996 3c298f89-4303-0410-b956-a3cf2f4a3e73
ubus: update to latest version

git-svn-id: svn://svn.openwrt.org/openwrt@35997 3c298f89-4303-0410-b956-a3cf2f4a3e73
firewall3: update to git head

 * Adds support for emitting hotplug events when creating and clearing zones (fixes miniupnpd)
 * Make NAT reflection direction configurable
 * Map init script stop action to flush
 * Map init script reload action to reload
 * Respect init script disabled state in hotplug handler

git-svn-id: svn://svn.openwrt.org/openwrt@35998 3c298f89-4303-0410-b956-a3cf2f4a3e73